Knob attachment



2 Sheets-Sheet 2-.

(Model.) T. D. DAVIS.

KNOB ATTAOHMENT. I

No. 327,886, Patented Sept. 29 1885 wz/gnesses: fave rf0n UNITED STATESPATENT OFFICE.

THEODORE D. DAVIS, OF VVILLIAMSPORT, PENNSYLVANIA.

KNOB ATTACHMENT.

fSPECIFICATION forming part of Letters Patent No. 327,386, datedSeptember 29, 1885. Application filed August 29, 1884. (ModelJ T0 atwhom it may concern:

Be it known that I, THEODORE D. DAVIS, a citizen of the United States,residing at Williamsport, in the county of Lyeoming and State ofPennsylvania, have invented certain new and useful Improvements in KnobAttachments to Door Locks and Latches, of which the following is aspecification.

This invention relates to the means of secur' ing the knobspindle to thehub of door locks and latches.

My improvement consists, mainly, of such a combination of spindle andnut that the spindle will be firmly bound on the hub of the latch andcannot be loosened by turning either knob. To adapt the improvement tolooks and latches now in use, the spindle is made preferablyin sections,which respectively engage the hub on opposite sides, and are forced tobind on it by a nut or screw connection outside of the hub.

The annexed drawings illustrate various forms of my invention, which Iwill describe in proper order.

Figure l is an axial section of a door lock and latch. A refers to thedoor, B, to the lockcase, and O to the latch-hub, formed with a taperingeye. The male sectionD of the spindle, formed with a skeleton knob,has atapering surface adapted to the tapering eye of the latch-hub, and areduced stem, which enters the female section E,also formed with askeleton knob, F. The reduced stem of section D is screw-threaded, andthe section E is internally screw-threaded, so that it may be screwed onsaid stem to draw the tapering part of the male section into thetapering eye of the hub, and itself bind firmly against the face of thehub. A jam-nut, G, is used to lock the female section. \Vhen made ofmalleable castiron, the prongs H of the knobs are originally caststraight, as indicated by dotted lines, and afterward bent over. Fig. 13represents a face view of one of these knobs, H referring to therecesses between the prongs H.

Fig. 2 is an axial section of another form of my invention. The latchhub G is formed with a projecting tube, I, against the end of which theknobflange J is forced by screwing said flange on the screw-threadedstem of the spindle D and then looking it, the spindle D being providedwith a tapering surface adapted to the tapering end of the eye of thehub, so that the spindle may firmly bind on thehub when drawn by theflange J.

Fig. 3 is an axial section of another form of my invention. The spindleconsists of the tubesI Iand the bolt D, havinga headat one end and a nutat the other. The adjacent ends of tubes I are tapered to fit tapers inthe eye of hub O. The outer ends of the tubes are flanged, so that theknobs F and F can be secured by the same bolt and nutthat forces thetubes into the hub.

Fig. 4 is an axial section of another form of my invention. Thelatch-hub (31's provided with a tapering rim, T, around its eye at eachface. The male section D of the spindle has a shoulder with a taperingannular groove adapted to the tapering rim at one face of the hub, andthe female section I has a tapering bore to fit the tapering rim at theother face of the hub. The two sections of the spindle are forced on thetapering rims T by the nutflange J, to which the knob F is secured bybolts L, and which screws on the screwthreaded stem H of section D. Thenut-flange islocked by a screw, K, which spreads the split end of thescrew-threaded stem. Section D is formed with a flange, J, for theattachment of the other knob, the flange being providedwith spurs M andnotches N, (see Fig. 9,) the spurs serving to engage the knob, and thenotches being provided for the screws by which the knob is secured.

Fig. 5 is an axial section of another form of my invention. Thelatch-hub O has a straight eye, round,or square. The male section D ofthe spindle is tapering where it enters the eye of the hub, and thefemale section I is also tapered at the end entering said eye. The twosections are drawn together, so as to force their tapers into the eye ofthe hub, by a nut on the screw-threaded stem of the male section. Thesesections have the cross-sectional contour shown in Fig. 10, havingchannels 0 and ribs 1? broadened at P, where they turn in the roses. Theknob G is detachably secured to the female sect-ion I, covering the nut.

Fig. 6 is an axial section of another form of my invention. Thelatch-hub O has a square eye. The female section I of the spindle has asplit end, (see Fig. 11,)fitting the eye of the hub. This split end istapered internally to cline of the male section.

receive the tapering portion of the male sec tion D, by which it isspread and firmly fixed in the eye of-the hub, and a jam-nut (not shown)being applied to slide the two sections of the spindle on each other andthen look them together.

Fig. 7 is an axial section of another form of my invention. Thelatch-hub O has a tapering round eye. The female section I has a splitend, (see Fig. 12,)which enters the eye of the hub, and is spread by thetapering portion of the male section D when the two sections are slid oneach other by the nuts, (not shown,) to be applied to the screw-threadedstem of the male section D.

Fig. 8 is an axial section of another form of my invention. The sectionsD and I are firmly bound on the hub O by wedging in the eye. To this endthe male section D has an incline along that portion which is in the eyeof the hub, and the female section I has a wedgeextensionto enter saideye and slide on the in- The two sections are slid on each other andlocked together by nuts, (not shown,) to be applied to the screwthreadedstem of the male section.

I claim as my invention l. The combination, substantially asbefore setforth, of the hub of a latch, aspindle passing through said hub andhaving a tapering surface,and a nut 011 the spindle to cause it tofirmly bind on the hub.

2. The combination, substantially as before set forth, of the hub of alatch, a sectional spindle having a tapering surface, and ascrewconnection for drawing the sections of the spindle together andtoward the hub, whereby the said sections of the spindle and the hub areall firmly bound together.

3. The combination, substantially as before set forth, of the hub of alatch, a spindle composed of a male section and a female section, eachof which is constructed with a tapering surface, and a nut for movingthe sections of the spindle on each other to force their taperingsurfaces into the eye of the said hub.

THEODORE D. DAVIS.

Witnesses:

J NO. K. HAYS, JOHN G. READING, Jr.

